Young bean plants are divided into seven matched groups, A to G. Each group is kept in a growth room under a different set of conditions, and its rate of photosynthesis is measured.
| Group | Light intensity in arbitrary units | Temperature in ∘C^{\circ}\text{C}∘C | Carbon dioxide concentration in %\%% | Rate of photosynthesis in arbitrary units |
|---|---|---|---|---|
| A | 0 | 18 | 0.080 | 0 |
| B | 30 | 18 | 0.080 | 14 |
| C | 30 | 26 | 0.080 | 28 |
| D | 60 | 26 | 0.080 | 44 |
| E | 60 | 44 | 0.080 | 18 |
| F | 60 | 26 | 0.030 | 23 |
| G | 90 | 26 | 0.030 | 23 |
Explain what the results show about the factors limiting the rate of photosynthesis in the different groups of bean plants.
117 exam-style questions on OCR GCSE Biology 1.4 Photosynthesis, covering 1.4.1 Photosynthesisers as biomass producers, 1.4.2 Factors affecting the rate of photosynthesis, and 1.4.3 Limiting factors in photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.